class LawDetailView(View):
 def get(self, request, law_id):
  type = request.GET.get('type', '')
  law = Law.objects.get(id=law_id)

  return render(request, 'zcfg-detail.html', {
   'law': law,
   'type': type,
  })

<div class="col-lg-12" style="margin-bottom: 20px;">
    <a class="{% if type == '' %}btn btn-danger{% else %}btn btn-default{% endif %}" href="" rel="external nofollow" role="button">全部</a>
    <a class="{% if type == 'fl' %}btn btn-danger{% else %}btn btn-default{% endif %}" href="" rel="external nofollow" role="button">法律</a>
    <a class="{% if type == 'xzfg' %}btn btn-danger{% else %}btn btn-default{% endif %}" href="" rel="external nofollow" role="button">行政法规</a>
    <a class="{% if type == 'bmgz' %}btn btn-danger{% else %}btn btn-default{% endif %}" href="" rel="external nofollow" role="button">部门规章</a>
    <a class="{% if type == 'dfgz' %}btn btn-danger{% else %}btn btn-default{% endif %}" href="" rel="external nofollow" role="button">地方规章</a>
</div>

kwargs = {}
if A is not None:
 kwargs['name__startWith'] = A
if B is not None:
 kwargs['address__contains'] = B
if C is not None:
 kwargs['mobile__endWith'] = C
...
...
personList = Person.objects.filter(**kwargs)
...